Submission #492338

#	Time	Username	Problem	Language	Result	Execution time	Memory
492338		Pety	Floppy (RMI20_floppy)	C++14	100 / 100	89 ms	14116 KiB

floppy

#include <bits/stdc++.h>
#include "floppy.h"


using namespace std;

int dp[17][40002];


void read_array(int subtask_id, const vector<int> &v) {
  string bits;
  stack<int>st;
  st.push(-1);
  for (int i = 0; i < v.size(); i++) {
    while (st.top() != -1 && v[st.top()] < v[i]) {
      bits += '0';
      st.pop();
    }
    st.push(i);
    bits += '1';
  }
  save_to_floppy(bits);
}

vector<int> solve_queries(int subtask_id, int N, const string &bits, const vector<int>&a, const vector<int>&b) {
  stack<int>st;
  st.push(-1);
  int ind = 0;
  int ind2 = 0;
  while (ind < N) {
    while (bits[ind2] == '0') {
      ind2++;
      st.pop();
    }
    dp[0][ind + 1] = st.top() + 1;
    st.push(ind);
    ind2++;
    ind++;
  }
  for (int i = 1; (1 << i) <= N; i++)
    for (int j = 1; j <= N; j++)
      dp[i][j] = dp[i - 1][dp[i - 1][j]];
  vector<int>ans;
  for (int i = 0; i < a.size(); i++) {
    int poz = b[i] + 1;
    for (int pas = 15; pas >= 0; pas--) {
      if ((1 << pas) > N)
        continue;
      if (dp[pas][poz] >= a[i] + 1) {
        poz = dp[pas][poz];
      }
    }
    ans.push_back(poz - 1);
  }
  return ans;
}

Compilation message (stderr)

floppy.cpp: In function 'void read_array(int, const std::vector<int>&)':
floppy.cpp:14:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |   for (int i = 0; i < v.size(); i++) {
      |                   ~~^~~~~~~~~~
floppy.cpp: In function 'std::vector<int> solve_queries(int, int, const string&, const std::vector<int>&, const std::vector<int>&)':
floppy.cpp:44:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |   for (int i = 0; i < a.size(); i++) {
      |                   ~~^~~~~~~~~~
stub.cpp: In function 'void run2()':
stub.cpp:101:30: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  101 |     if (query_answers.size() != M) {
      |         ~~~~~~~~~~~~~~~~~~~~~^~~~

• Subtask 1: 7 / 7
• Subtask 2: 21 / 21
• Subtask 3: 72 / 72